ASN Wikibase Occurrence # 352339
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| Date: | Wednesday 17 November 1999 |
| Time: | 12:40 LT |
| Type: |  Cessna TU206G |
| Owner/operator: | Gulf Coast Aerial Mapping Co. |
| Registration: | N4803U |
| MSN: | U20605109 |
| Total airframe hrs: | 8860 hours |
| Engine model: | Continental TSIO-520-HCM |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Lafayette, LA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Baton Rouge, LA (BTR |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During an aerial photography flight, at 3,500 feet msl, the pilot noticed the 'engine noise get quieter,' and the engine lost approximately 5-6 inches of manifold pressure. The photographer/crewmember noticed that the oil pressure gauge was indicating zero. The pilot initially planned on making a precautionary landing at an airport; however, the engine experienced a total loss of power, so the pilot set up for a forced landing in a field. The pilot reported that he misjudged the approach and was too high and too fast. The pilot added that he landed with a tailwind and overshot his intended field, and the airplane went through a barbed wire fence. During a post-accident examination of the engine, it was found that the #1 connecting rod failed near the connecting rod cap. The #1 crankpin had the connecting rod cap bearing melted into the surface, and the surface appeared very dry and discolored. Inspection of all the rod cap bearings revealed that they were reddish brown in color, indicating that there was a lack of oil supply through the oil galley of the engine. The oil pump was found intact, free to rotate, and the gears were coated with oil.
Probable Cause: The partial blockage of oil within the engine's oil galley resulting in a total power loss. Contributing factors were the failure of the #1 connecting rod, the failure of the pilot to achieve the proper touchdown point during the forced landing, the tailwind and the fence.
Accident investigation:
 |
|
Sources:
NTSB FTW00LA033
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 11:04 | ASN Update Bot | Added |
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